A shrimp girl is basically a slang regarding to that kind of girls that work-out a lot trying to keep there fit bodies that Almighty God gave. But God got so carried away on sculpting the body that he forgot the face.

In a nutshell, Shrimp Girls have a hot body but they're not beautiful.

Shrimp is because when we are going to eat a shrimp we are supposed to take its head off before eating.

Guy 1: That girl over there is a Shrimp Girl.
Guy 2: A Shrimp what?
Guy 1: Shrimp Girl.
Guy 2: Shrimp Girl? How does it work?
Guy 1: Well, you know...wipe out the head, eat what's left